Apparatus for producing sulfuric acid.



E. H. MOFARLAND. APPARATUS FOR PRODUCING SULFURIG ACID.

APPLICATION FILED MAY 10,1913.

PatentedSept. 29, 1914.

I Inverwton M Flangi fitt' Edward H. W

Witnesses ing is a specification.

'. ducing sulfuric acid from the smoke-and v v lead-lined chambersin which they are treat? into. the lead-lined. chamber.

" UNI ED strains;

T NT m. I

.EDWARD'H. MCFARLAND, OF'VCINCINNATI, p310, nssrenowro ennnnan ELECTRIC a COMPANY, a conrom'rron or new rzoiuza APPARATUS FOR rnonucmesum unre Acrn' Y '0 all whom, it may concern:

1 Be it'knovv'n that I, Eownnn MGFAil:

LAND, fa citizen'of the United States,.resid ful lmproyements in Apparatus for Producing Sulfuric Acid, -of which the follow-,-

l\'ly.. XIVEDtlOIL relates t pparatus used forproducing sulfur-1c acid from smelter:

known as thedead chamber-processofpro fumes-given oil by coppersmelting furnaces, the gases are conducted through large ed withlst eam in the presence of nitrogenv 'peroXid, the latter being reduced to; nitric oxid and 'the sulfuric acid collecting the bottom of. the chamber;

which operate directly thereon to force them This arrange ment necessitates lining the chamber of the thepr'oduction' is totaled. i

Ihave invented or discovered an: arrange-o blower with lead to protect the same-from;

thegaction of the gases, and. for'the same reason. the rotating part of. theblo'wer-Z' should be similarly protected. 'Thi's obvi-f ouslyiincrease's-the cost of thei -apparatus. Furthermore practice has demonstrated that {the dust accumulations i'ronr the furnacechoke upthe blades of the blower", the latter.

being. located between the! furnace-and the;

acid house. Another and verygreat 'ob-f jection -is --the ,difliculty oi ---determining whether the 'speed of .the blower is. proper; each twelve hours? run -when i 1 struction is arrahged to.delii'er-air intosaid vnozzle. to create an draft. v up -through; the stack; The blower isdriven'by-anJelecti-ic 7 except after merit whereby the proper-movement of the gases through the system: can" be accomplished by a centrifugal blower or compres sor without sub] ecting "it to the destructive,

action' 'of the gases, which-blower .or.=compresson s arranged to automatically main tainthc' pr'oper'rate-of flow of saidgases. o I- attain these highly desirable-results by ax-ranging the compressor-or blowerto act by induction upon the column of gases flowing from-the last chamber of the system, the

o slight vacuum produced serving to suck the The nitrous gases: are :drawn. oif from the chamberandfi-sii jected to further treatment to recover the nitrogen oXids. Heretofore the movement] 10f the gases has been 'efiectedi by! blowers E'Themovementof this float is utilised. n 1. control? the m0tor -j;whicli. drives jthe, blower, [For ,example;-.- -I may use direct current 5,

a n ation aieaua 104913.;s riainaveeue. V

fumes through I the while '7 the ct s ecim n or'r etterj's rais c'Patented 29; 1

. ofair from said bloweror compressor, after creating said: vacuum, acts to expel the exs cess uncombined fumes.of wsulfuric @Cld arrangement none of the gases passthrough 's ulfur -dioxid and; nitrogen dioxid. In this -6,0' theblower or compressor and hence-the need i v for lead coyerings is entirely obviated; Fur' thermore since the gases do not pass through the blower or compressor the dust carried along with-the vgases g has no effectfon the blades thereof; 1. g 1 1 In order to insure the proper speed ofjthe I 'blowerg' or compressor, and. vary it v with the 1 v .olume. ofj-gases passing through'the 'apparatus, so that the rate-,ofioutput of i; the; gases; will be constant,i.- a s is i'iecessary to}, ,produce the best results ,lplacein 'theexitl gpipe of the ;;1ead cham ergja. 185a, float,;riding on the column; of gases ;.t h erein 1 a 1:7 5

covered, i

}- lele ctric,motor and arrange the. lioatto rary the fiel'd strengthojf said InOtQ lf in ord er to --.i vary its impeller --speed' in accordance vwith; the volume of gas "passing atuFanywigiren instanta "Th p y n a ng i -d a r "illustrating one of the embodiments of my The lastchamber of theappara-tusis indi- =ca'ted at.1. Withits exit pipe Zleading .toa,

invention. I

stack 3. Entering said stack which is an: I

;e 'ctension of the ;:pip e is a nozzle 51: whichis cap able of long tudinal adj us'tnie'nt and cooperates with a taperingisection 5- of the stack, so that-the elfect of. ,saidjnozzle as a jet-ejector. canobe'regulated. A centrifugalmotor- 7, ;;liere shown as a shunt; wound direct current motor taking current-from fsupplylniains. 8. In the, fieldcircuit of this n otor. is a. rheostat 9. whose 's'witcl'farm' l0 ts -connected by a rod '11 to a lever 12 ful cfurn'ed on'a stationary support 13 and caratd to this lever is aired l5'which passes dowil into an upright portion .of the exit pipenndcarries at its lower end a disk floa't 16 exposed to the column of gas coming one influences.

. ofgas' passing out of said chamber and con this way, therefore, j the 'oiitput' of the ap and a device responsive to variations in the ations oft he volume ofgas passing o t-,

from the chambervl. The exit pipe has a' conical enlargement 17 3.317 thisrapoinqizco-ii operating with the disk float so that said. float; operates to enlarge-pr. diminish thean-s nular passage around" its periphery as it rises and falls in the exit pipe'i" Theflo'at' tends to varyits position in accordance. with the speed of the gasespassing by 'iti If the; speed-,- and consequently-the volume of gas increases, the-float will belifted to open -the supply' of energy to said motor. 5. 'Th'e'combination with-the lead chamber 4 .of a sulfuric acid apparatus,-of an exit pipe therefrom, 'a" stack connected with said exit pipe, a nozzle entering said stack, a blower I 'f-delivering air to-said nozzle to suck gases from said chamber through said exit pipe the 1' exit. This movement f tends tog-cut? out some of the resistance jfrointhe field circuit and sloW down the driving motoffso'jthat the draft will be lessened and the volume of gas :will becut down ;to normal agaim In parat'us is maintained at a=- normal? figureandtheblow'r isprotect'ed-fromall In accordance with the provision of the patent statutes,I"have described the princi ple o f operation*of my= invention2togethen i 1 6; 'The combination with thelead chamber ,andstack'of a sulfuric acid apparatus, of a fnozzle in the"stack, a blower which 'dis- "charges"*air into the nozzle and creates an outward draft in the stack and the chamber, a motor for driving the blower, and means responsive to variations in the volume of. l'gas flowing from the chamber for controls ling the amount of air delivered by the with theapparatuswhich Ianow- 6bnsideii to represent; thebestembodimeiitithereofj but I desire to li'ave 'it'lzunderfiood'ithatithe zip,- parati ls" shown is; only'-' illustrative, Y andPthatY- the invention can'pbe ca rried oiit iby" -othen' ns I'j w? i What I- claim as new and desire 'to' secure bygLetters lziterit of the'Unlted statesyis l? El e combination with th'e lead chamber -of a sulfuric acid apparatus, bfa blower for producing a draft. through said chamber,

volume of gas passing out .of said chamberand controllin the speed 'ofsaid blowerd" -2. The combination with the leadchainber of a sulfuric acid apparatus, of. ancjector nozzle for producing a draft through said chamber,"a blower delivering airto said nozzle, a motor for drivingsaid blower, and a device responsive 'to variations in.the volume trolling the speed of said motor.

3. The combination with the lead chamber of a sulfuric acid apparatus, of an ejector nozzle for producing a'draft' through said chamberya centrifugal blower delivering air to said nozzle, an electric motor for driving said blower, and a device responsive to vari-k said 'chamber and'contrclling the supply of current fOI' Sfild motor.

. 4. The combination with the lead chamber of a sulfuric acid apparatus, of an exit pipe from said chamber having a conical engage ment, a disk float located in said enlargement,

.a blower, a nozzledelivering air from said blower to induce a 'draftthrough said exit pipe, motor for driving said blower, and

means connected to said float for controlling and expel them through said stack, a motor for driving said blower, and a'fioat riding upon the column of gases in saidexit pipe andlserving to regulate the speed of said blower;

7. In combination the lead chamber of a sulfuric acid apparatus, a pipe, one-end .of

which is connected .to the chamber, the other being open to atmosphere,- a nozzle'that extends into the pipe beyond the chamber and discharges air toward said open end, a rotary blowerthat delivers air to the nozzle for creating an outward draft in said pipe, a motor-for driving the blower, and a means "for varying thespeed offthe motor in accordance with the rate of flow of from the chamber to the ipe.

In witness whereofiI" ave'hereuntoset 1 my han'd'this semlitii cayofMay, 1913. I

EDWARD-H. McFh'RLAND. Witnesses;..

w s-lo m, H. LfKno'wr 'ro'zi,

the gases Copies ot'tliii patent may obtained "for five cents each, by: addressingthe Oonimiss1oner -oI-=-I'atents,

Washington, D. 0.".

Correetien in Letters Patent Me. U 19 24.

It is hereby certified that in Letters Patent No. 1,11 2,4241, granted September 29. 1911, upon the application of Edward McFarland, of Gineinr1at-i, 0hio, for an improvement in Apparatus for Producing Suifnric Acid, an error appears in the printed specification requiring correction as follows: Page 2, iinee 56-57, for the Word engagement" read enlargement; and that the said Letters Patent should be I read with this correction therein that the same may conform to the record of the ease in the Patent Ofiice.

Signed and sealed this 10th day of November,

' R. F. WHITEHEAD,

tsnnh] Acting Uomm-isa'ione?" of Patents. 

